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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8463a2b92e61d3bcea21b0aa3dcb64897e61b81f72b82c1c010c236ed0ad78' 
  AND token = 'OC4x0xAXMp3cijjMvdWN6j3idYeaUIKFQUsJ+4tt8bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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