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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d50c7d8fe48cc635e26c5d942dc4af99923bd8670e4f214cfb6c36494bd182f' 
  AND token = 'vuk0dyvX6SV1yJW2vQXUmtUMVlkFSjfFmPpiVAIRrCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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