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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71428a85107b0f73e9db28a40d90c46da4e3a314451af9f2681a2a14c5d2b6e6' 
  AND token = 'awnLKGJUD7GCS1cKwCvk21ATLIS7ht6Sk1Me4bED29M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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