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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dce97d9b3d81e50de7a4c1ba347a997b8be9ecd26a8fa59d5b2f70e3cec7faf' 
  AND token = 'pwQ+GTl4DP8G1SB5PrCJCUl5lj7+HdlJFTIY8RJtuaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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