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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd147bb4c3884ee35f2906715d88219ecd192d508f339131bb16d01a099cc60e' 
  AND token = 'Q1WlrKvsIGb/QfIvpQ6LYSRk2JH8ljRMtsFQZf5Ac3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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