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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce7ed739ccfdc754c408dadacade8ae2e6ef5316ab9ebbaed647344363645f3' 
  AND token = 'ocyi+SRKYwrq4zIa13avqQQbTVt9emkG8B3tWXPZ8G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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