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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c064a0bd7ca5df125578eee3029d9593e86777b7f17cd8cf21a6636cc92312d1' 
  AND token = 'd5lXxTv7wIggwahYt+zdRs3sww7+NvRaE8azpEZmpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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