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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4970e1d378126f25ca69c90a90b6af43abf0218a20d3381a126c0ac1a2158ac' 
  AND token = 'mbkZkQp8sJhUxeMPBtpJZd1i3t/A/DD1xj57xSfXlgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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