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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1db3915608e8dfd46d88f1bfc7fe7d7a0e3f7a361befd1c07457be366d87e16' 
  AND token = 'YzRX4g3Pn8OIo0nFDRZZNAxXroSgMcR9PzFqRNQf2ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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