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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66a01b1dbf6688a6bd72a6eab8cc5b05cdb431e35c142ea06d0c008bd51fa69' 
  AND token = 'WxizQ7CuOh6RjfR4J3cS1Jamhv5F8+iTd2g8o6smywY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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