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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61b0f39a97b7f2222d63ce48d352f8a928ad8a861e831f54bff2fe12788da42' 
  AND token = 'f9DaDZtr4mCGh42bA/ZxJSYhF1ZmgfENYsIKO1LYYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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