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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a739155767c34f5324b23e62e9edb901d562874cd2e2a0c812d61c1815aebf96' 
  AND token = 'l0vN+X2cWbb9yKdtSSNglv42ScfQMbz1EXqxsKW02sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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