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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a512adbf7a1b7d169b16723e059ca7135246afb4b9536f3b93fd4c6fa59f52' 
  AND token = 'c2WNll7J/v5/nUXQTigaGREOBB9ryhnEUOEYZ2BlSeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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