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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7591b88aa61d9f53862d6e6fb81f3855e04998701b7810c5752efede473c1731' 
  AND token = 'nFRsBYrDJOsZtBmVufK2RAe8kiu++AHYIy4lQMRG13k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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