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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77253052f62011da286896c04a3090ebe3a3bffb99de7fb5527ae579a56d6c5b' 
  AND token = 'Yz75763+x4oA++YofoVJgGLQ7xK7UtruQKbkFLQWCTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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