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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061e8b46e87e28900e8bd75dd38169091537d9e1aac8f2d8e4c8ed9980852d52' 
  AND token = 'Z5U2TZTStlR/Q9tVQzyKXr6Dll0ZrH77YdWw689u6OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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