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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aeb20f482b84e4209bb090d3129a4520a78d3182242688253acf90ab8f5ae8c' 
  AND token = 'VEF4tJfMALBEKBKnbUkAoKtu8dCg72BhH8BPsdWRdc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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