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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f30bbbed526b676c8f19a80b35fe16e4f49e837df794681831ee5f7c4ee05b' 
  AND token = 'B7H5S81VhD8MT7GflOoI5puBREfQ6n0YvIBh8WkcJI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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