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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008e7bfab05e22ed7c0a80cdd60afff38d6df80a9c6d937cdbd43eba4592e73a' 
  AND token = 'VtNL7JHqqvXVCyJEqSmxr3HHAmq54QpmT9EO9pQTuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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