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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e5027a219c52d6842ebc97f65c08c4b3e13f85ef091c3fae9e0f3ca9373110' 
  AND token = 'qYpq9DFLl931ZemdxKs0Jq2wTheWRbrt7QyQsNEilcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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