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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5379aaf1eba6177f7a8ea7d8393cc7d65470213cdaec2429c90cb2c6629f06' 
  AND token = 'MxPSvKk1viHiM89HzvNjwS2ZojfpjOSChp1AfDsMwe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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