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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b3026cb0fcf69a444833a5c7b30cecee2dfcba396fb22cf763e3b97a7089b' 
  AND token = 'HT3HPNhXwhdQi+6ixFzuxi47nCpj1zB4DUZInGJ5e50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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