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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbad195a5bcfe96925a1239e6e7dc973065602ca0bee0cf3d512bee16353f64' 
  AND token = 'K47CP2Cpy225tv3UnNac9LvC4jd0fEPTMoB+wtJiscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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