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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc688642f99879047a3cf20e409fcd02947fb8773f88b6b1a287514d1aebe43' 
  AND token = 'uEosS6J/bttpqrHQi+is9L3JmRrNGYamLJqzNS8Z1vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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