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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f01e33b11ac23c3fd98ae9563b8395e7e922f045098dd8e77377e6e2bdbcc8' 
  AND token = '2r3zZnuGp+Ddmb+aDkPviLb7UsBYjiF4qX90S/7IqpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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