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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7ec06770f6edaa0b5dfb5abda0f14d38d1e3cc7fe234e89ebc7b911be8b8fd' 
  AND token = 'C4ebB15XJiWSvvkOClD0jGFleyGNir7DbHIRao6eB2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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