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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362da9bf14894e387286fb4a8595dd4d12d6e5b5b6f6c3ec06041ce7a3ecf36e' 
  AND token = 'sNedFDKsqprldljlIuOvTwNgd3cSrmJIesjWagN/M6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}