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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e953499ff1d1325515a63b6f729c6acff39df2c1dbeb3fda4ccfd1bc30bc1406' 
  AND token = '4xQW+Gi9SgwgnDW3ifIaWDKWDSzyBAosUcZm6pf2pFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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