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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9949382d0ed3d51e85c45c854795cf88c99de8f9dda22cb25753fa3bc0bf5dec' 
  AND token = 'VzlFaLwX4OMCSsuoihQ98BHVabzdbyUGbbaQKIoRPbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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