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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92701c9ab093efe8f8059771b649d8257fa5a98b7567cb71bfa5e4ac70b887a4' 
  AND token = 'nci85+7Om2S6EgG/DAFt/4JPSzxG2S//KCpjQpAbLH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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