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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693b948f088c51e643f1d4a47cf2e5b3b127ac7b6f1b2d3c1c8e3c844c5d9bb2' 
  AND token = '50jQRIgwjncwqfuXu6U1r88eFoz3nRluqaMNs7use7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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