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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d9365ee223cf3ac64f875cf88207642bd379eab744b651b1bc211a37066565' 
  AND token = 'C6rluL9z8Td0VM884onFZW+pgH8dAEamh7Hz9qtdDMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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