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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757c73e8a467aa6dc8f881c7f31cc88641d47e8eade5c8f5c55bc68f2d72cc26' 
  AND token = 'qTvIFURVAZDvIapyD7kHXJ7WTrEhepuBukROLjuH02M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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