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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9fa79cbff49b5dd5308aa52da40751c62adfd28b1790342a6651ea01ffc290' 
  AND token = 'CPmFbia8sDLHcFb6BMV5j8C5q288Oaj8Yl6FqPCmEsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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