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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3633a98f4de6489cd586509ea6aeb48bb84b82275616ca3f7e2a873a44d64049' 
  AND token = 'hCs8Jjf/bCftd5ZCp3a+7Mwn2HBpR1tr3HPd6RnwD8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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