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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc4ab6f619efc35958234a96dd02d40be8f4815909570d9e6d497450523d009' 
  AND token = '0UpCRc1kevEUzKpqSfRvDEnzWNMIcnWnJe8xyzOQS8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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