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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8622bcfdc293e1c9dc9cf8f3177216c0712b6c0a823e02527cfdc782a56b4788' 
  AND token = 'N1M3/SzsiKiLTnBbno93YVOr2Wr93iMxcSnUeN4wbq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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