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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d284cbd3c67f114b0628fb11f4aabb73ccf7335630381df97c42bc6ed3f7662' 
  AND token = 'ebQDZap/bohKXAzRo7ed2/XwCstWtDukzrs9dFcrl9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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