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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1994442a41f6cb351812906b8e5f420630035d54bc89bd772fa363abadd0e5eb' 
  AND token = 'M+rP3GmevjeYhkdCRbmMFcPCuS9s13kQtjPPNs9lJxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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