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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157619b2b1862e5811e078c660e593f20ec72f089cc824a413078c08bb6e92d3' 
  AND token = 'bTheTvIdhxhKG067fQggv59nbadas4nIWD82dOSsYdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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