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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e1944d7d929202ef5346bc3b8608ba01673995c627ba37e0a3b1e1e1cb1cf9' 
  AND token = '0ylJW4oBjzdASMxFcNUYmI+NmCuhTuVwDTwmo9Qno68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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