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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5b02f9b314e9bc9165500f7bd321b53acd10be16e53a255e5f1c5f0e82fcf8' 
  AND token = 'zUKXKkozEPT5ZQR2/p/NBWk9bCM6vRotB6o/jthNWXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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