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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f252c0e1ff8b00c46baeb302c240a469aadc338ad49a10f4070db270fadbd0f9' 
  AND token = 'oJ4kqcnVsRtRoh+KwM7oQho/LMeruxsIg8KwOLprCRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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