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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3cc9fc19013bece8a2256c1b0bf65d8a06ea4d51d6d3fe8035bdfb5cb60c05' 
  AND token = 'AdaS8/p7Y/hTRUZV1zGRYZeuL6p5f/urT0Dfl0ltlDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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