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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5260422b5e03d63a0df8243adba49e5c97bd571933c1190a7257c61894b14c1b' 
  AND token = 'zdxz4jD/PJZcpTdbkvXfcAIy3Cb7AQbLAoExK5+D4LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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