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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbc5bddf7099315363865285006292cc18d575942041396eb5d5c10c691355d' 
  AND token = 'TdEL1/xUIZTVdYLXfo5Qyhpy+VOI6Frt2ExQAABUuYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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