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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a232932a34b1738657d364773ab9542288f29783b06d91c3580ad4e7ec29bc33' 
  AND token = 'w4C5xZyYLx9YPIlvKAphOkZAQBt5LwJnryh8PEpFMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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