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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6f18eae06f8b0432535bde1c774a0f97467d33c659811d3117bb22ca59a64f' 
  AND token = 'yiSaATnKKQS7rCZK84Pz3+7rg6jrsJS6rNeupblE2fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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