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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e1261711e05d0974e7e1b2c1a6a561dc4ef0e6324eb87460de42f93a52e7b2' 
  AND token = 'Hok2ifeCHYg9cKB59qyWv+8EKE+8B9WXgWDT0dntiPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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