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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a5dfba485cc1b13d90dcb7ffdc2668d2442626df5569d0eb9e17a493f26969' 
  AND token = 'NGvG94acXzfvk13Kd/0uXUYocSoPkxDm7EwqxqDFspY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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