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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fdaa040a64184e08d28cfe845a99f490a85081c3dcf3d3085fb9cfc106cae9' 
  AND token = '7hGg8+EWoKHJ7M0eI2H254IUsx2SGcPVQa7QuZRsi9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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