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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa57c41e71dbe2aaf8d0cf858f49232fc6d9116c4984f03b6706f5dec2c7e060' 
  AND token = 'kX5JHS6tdco/e+U50toOQnoCdU0NYgx1QndFMEKEQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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