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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8629dd51f7aec21f264bde0d5848d3baf1ee1ddbfaa14d4335a43a36042a3d9' 
  AND token = 'qzdoGimK7QkGx0q+LTX4pFX8x4ziq3Rh9CupUXT8Bmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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